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Gossip Girl Producers Ask: Who IS Gossip Girl?

Who is Gossip Girl? For five years, that's been the secret she'll never tell.

This fall, however, the show's biggest mystery will finally be revealed!

In a new promo teasing the final season, which gets underway Monday night, executive producers Stephanie Savage and Sara Goodman promise that by the end of the 10-episode farewell, we will have our answer.

The cast members themselves are asked for their theories, which include:

Dan

Jenny

Dorota

Blake Lively's dog Penny

Vogue editor Anna Wintour

Pretty fun promo, and pretty cool that they're going to answer the question at all. Who do YOU think Gossip Girl is? Someone we know or a character we haven't seen before? Share your guesses below!